Cao Lili, Li Qipeng, Niu Zhongwang, Zheng Yuanyuan
School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Ningbo Sunny Automotive Optech Co., Ltd., Ningbo 315400, China.
Polymers (Basel). 2022 Feb 21;14(4):822. doi: 10.3390/polym14040822.
A new type of specimen is proposed for further research on the structure of glass-fiber-reinforced resin matrix composite lamina, which holds the potential to significantly improve the fatigue property of materials while having limited effect on the tensile strength. Herein, the fatigue life, based on the monotonic tensile test, was simulated utilizing ANSYS and nCode analysis software. The results show that the tensile strength of the local notched fiber specimens is slightly lower than that of the continuous long-fiber specimens. However, when extending the notches' longitudinal distance, the impact to tensile strength becomes smaller and smaller. The results show that, when the longitudinal distance of the notched fiber is greater than 80 mm, the reduction in tensile strength is less than 0.65%. At the same time, the fatigue property of the specimens is improved considerably. It has been found in this experiment that when the notches' longitudinal distance is 100 mm, the notches' length is 1.5 mm, and the notches' width is 1.75 mm, the fatigue cycles number of the specimens reaches 126,000 cycles, which is about 180% higher than that of the 0-0 type long fiber specimens without notches. This investigation provides a robust foundation and is a compelling basis for further exploration of new fatigue specimens.
本文提出了一种新型试样，用于进一步研究玻璃纤维增强树脂基复合材料层板的结构，该试样在对拉伸强度影响有限的情况下，具有显著提高材料疲劳性能的潜力。在此，基于单调拉伸试验的疲劳寿命，利用ANSYS和nCode分析软件进行了模拟。结果表明，局部带缺口纤维试样的拉伸强度略低于连续长纤维试样。然而，当增加缺口的纵向距离时，对拉伸强度的影响越来越小。结果表明，当带缺口纤维的纵向距离大于80mm时，拉伸强度的降低小于0.65%。同时，试样的疲劳性能有了显著提高。在本实验中发现，当缺口的纵向距离为100mm、缺口长度为1.5mm、缺口宽度为1.75mm时，试样的疲劳循环次数达到126,000次，比无缺口的0-0型长纤维试样高出约180%。本研究为进一步探索新型疲劳试样提供了坚实的基础和有力的依据。
